Incident Overview
During a local flight, the pilots noticed oil accumulating on the windscreen and experienced airplane vibrations. They decided to return to the departure airport. On approach, however, the airplane was too high and fast, prompting the pilots to initiate a go-around.
Sequence of Events
The pilot applied full throttle for the go-around, but the maneuver resulted in little additional power and very high vibration. As the pilot executed a left turn, the engine completely lost power. The airplane subsequently struck trees and shrubs during the forced landing.
Examination Findings
Post-accident examination of the engine revealed that the 'P' lead insulation on both magnetos had deteriorated, causing intermittent grounding of the magnetos. According to an FAA Inspector, the 'P' leads were likely original equipment on the airplane, which was manufactured in 1959. The inspector noted that the condition of the 'P' leads could have caused the magnetos to ground out, leading to a loss of engine power.
Pilot and Maintenance Information
The most recent annual inspection of the airplane had been completed almost 14 months before the accident. Additionally, the pilot did not hold a current medical certificate or biennial flight review at the time of the incident.